In a method for determining the alcohol concentration in the alcohol/water mixture of fuel cells that are operated with this mixture, in particular for direct methanol fuel cells, the alcohol/water mixture is pumped through a constriction. The differential pressure between the entry to and exit from the constriction and, if appropriate, the flow velocity of the mixture through the constriction are measured, and the alcohol concentration is determined therefrom.
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March 25, 2002
March 25, 2003
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